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Temperature-dependent structural study of microporous CsAlSi5O12 by Martin Fisch; Thomas Armbruster; Boris Kolesov is a Materials Science article available to read on EtoBox.

What is Temperature-dependent structural study of microporous CsAlSi5O12 about?

CsAlSi 5 O 12 crystals were synthesized at high temperature by slow cooling of a vanadium oxide flux. Single-crystal X-ray diffraction structure analysis and electron microprobe analyses yielded the microporous CAS zeolite framework structure of Cs 0.85 Al 0.85 Si 5.15 O 12 composition. High-temperature single-crystal and powder X-ray diffraction studies were utilized to analyze anisotropic thermal expansion. Rietveld refined cell constants from powder diffraction data, measured in steps of 25 1C up to 700 1C, show a significant decrease in expansion above 500 1C. At 500 1C, a displacive, static disorder-dynamic disorder-type phase transition from the acentric low-temperature space group Ama2 to centrosymmetric Amam (Cmcm in standard setting) was found. Thermal expansion below the phase transition is governed by rigid-body TO 4 rotations accompanied by stretching of T-O-T angles. Above the phase transition at 500 1C all atoms, except one oxygen (O6), are fixed on mirror planes. Temperature-dependent polarized Raman single-crystal spectra between À270 and 300 1C and unpolarized spectra between room temperature and 1000 1C become increasingly less resolved with rising temperature con

Who reads Temperature-dependent structural study of microporous CsAlSi5O12?

Author

Martin Fisch; Thomas Armbruster; Boris Kolesov

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0022-4596)

Published

2008

Language

EN

Field

Materials Science (Physical Sciences)